Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Dispersion, ionic bonding and vibrational shifts in phospho-aluminosilicate glasses
Δημιουργός/Συγγραφέας:	Grammes, Thilo de Ligny, Dominique Mathew, Dintu Griebenow, Kristin Scheffler, Franziska Lindner, Florian Aichele, Claudia Dellith, Jan van Wüllen, Leo [EL] Καμίτσος, Ευστράτιος Ι.[EN] Kamitsos, Efstratios I. Brauer, Delia S
Ημερομηνία:	2024-05-08
Γλώσσα:	Αγγλικά
DOI:	10.1039/d4cp00685b
Άλλο:	38655850
Περίληψη:	Understanding the relationships between structure and properties of aluminosilicate glasses is of interest in magmatic studies as well as for glass applications as mechanical or optical components. Glass properties may be tailored by the incorporation of additional elements, and here we studied the effect of phosphate incorporation on refractive index and the degree of ionic bonding in aluminosilicate glasses. The studied glasses in the system SiO2-Al2O3-Na2O-P2O5 had a metaluminous composition (Al:Na = 1) with the content of SiO2 ranging from 50 to 70 mol% and of P2O5 from 0 to 7.5 mol%. Refractive index was measured at four wavelengths from visible to near-infrared and found to decrease both with increasing P2O5 content (at the expense of NaAlO2) and with increasing SiO2 content (by substitution of SiO4 for AlO4 groups). This trend correlated with a decrease in density while, additionally, the formation of Al-O-P bonds with an SiO2-like structure may account for this change. The degree of ionic bonding, assessed via optical basicity and oxygen polarisability, decreased with increasing P2O5 and SiO2 content. Despite the complexity of the studied glasses, oxygen polarisability and optical basicity were found to follow Duffy's empirical equation for simple oxide glasses. In the high frequency infrared and Raman spectra, band shifts were observed with increasing P2O5 and SiO2 content. They indicated changing average bond strength of the glass network and showed a linear correlation with optical basicity.
Τίτλος πηγής δημοσίευσης:	Physical chemistry chemical physics : PCCP
Τόμος/Κεφάλαιο:	26
Τεύχος:	18
Θεματική Κατηγορία:	[EL] Οπτική. Φώς[EN] Optics. Light [EL] Χημεία[EN] Chemistry
Λέξεις-Κλειδιά:	Alumina Aluminosilicate glass Optical correlation Oxygen Polarization Silicon
EU Grant:	SPP 1594
EU Grant identifier:	BR 4608/5
Όροι και προϋποθέσεις δικαιωμάτων:	This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1039/D4CP00685B
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο